Only D600 has the dust/oil issue or its regular about Nikon cameras?

I own a d70, d90, d7000 and d600. D7000 had some oil but nothing like the d600. The lubricant issue on the d600 is in another league. I recall early production d7000's having similar issues. On some of them the mirror box motor from one vendor was found to have a over lubricant problem and that part was replaced. We may have a similar issue with the d600 and it may be combined with poor dirt QC at the new plant that is camera is assembled at. I dont trust people that say i have no issue because most dont know what to look for or test it correctly. I agree every sensor gets dust but I just cleaned at 1220pm in the afternoon and did a time lapse test at midnight and I can see oil gettind added again. I will say I think at some point it will run out but it is a joke to think everyone can do a wet clean every 1,000 shots or that they also want to shoot 3000-9000 shots to get most the oil off the parts. This is very poor quality control and I think nikon had to know this during the field testing and felt it was okay. How would you miss this. You are telling me that every test camera had no over lubrication show up and they had no idea? They dont pull samples during assembly and test them? It is not like this just shows up years later we are seeing dust/oil at 100 frames and day one for some.